Of the seven terrorists identified so far in the Friday massacre, most had direct ties to ISIS and all slipped through the cracks of international security, even as some raised glaring red flags along the way.

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Most died during the shootings and bombings in the City of Light, while two still roam free — the alleged mastermind, and a suspect who passed right by police. Police have not said how many militants overall are believed to be involved in the slaughter, which left at least 129 people dead and hundreds more wounded.

Allegedly the sick mind behind the whole operation, this Belgian is also linked to two thwarted terror attempts in Paris this year: a would-be attack on a church in April and an attack on a packed passenger train, which was foiled after heroes on board intervened.

Abaaoud has been a known ISIS member since at least last year, when footage from the terror group showed him packing corpses into a truck with fellow thugs in Syria, according to the Associated Press.

Officials have not said where the alleged mastermind might be.

SALAH ABDESLAM, 26 (ALIVE)

A Brussels-born suspect accused of renting a car used in the attacks, then dropping off the militants who killed 89 people inside the Bataclan concert hall. It's unclear if authorities suspect him of directly attacking the Paris victims.

International manhunt for Paris terror attack suspects

Police named him as a suspect after finding a car with a Brussels parking ticket and three AK-47s inside — but the suspicion came too late. It was later revealed that authorities at the Belgian border had stopped Salah just hours after the attack, but let him drive away after checking his ID and asking a few questions.

French police told the public Salah is "dangerous" and should not be approached if found.

Abdeslam is brothers with another man also connected to the attack.

IBRAHIM ABDESLAM, 31 (DEAD)

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An undated image of Abdelhamid Abaaoud, published in the ISIS magazine Dabiq. (AP)

A brother of Salah who detonated an explosives vest outside the Comptoir Voltaire cafe.

The mother of the monster brothers, Faklan Abdeslam, said she knew Ibhrahim had traveled to Syria, but was "surprised" to hear of his heartless demise, according to The Telegraph. She blamed his suicide on "stress."

Authorities believe Ibhrahim seriously injured one bystander with his blast but did not kill anyone. His family said this shows Ibhrahim did not have it in him to murder civilians.

Mostefai lived with his family in the French cathedral city of Chartres, and neighbors said he kept to himself. He traveled to Syria several times in the past few years, and one of those trips put him on surveillance, French officials said.

SAMY AMIMOUR, 28 (DEAD)

Another Bataclan bomber who was already under watch for terrorist activities. French officials questioned him in 2012 for links to terror sympathizers, and police put travel restrictions on him, which reportedly had little effect in keeping him from Syria.

The passport of Ahmad Al-Mohammad. (ANDREJ ISAKOVIC/AFP/Getty Images)

Amimour's father told Le Monde he pleaded with his son to cut ties to ISIS and even traveled to Syria last summer to try talking some sense into him.

BILAL HADFI (DEAD)

Identified as a Bataclan bomber and said to be 29 or 30, but no other information is known, according to The Associated Press.

AHMAD AL-MOHAMMAD, 25 (DEAD)

The true identity of this suicide bomber may still be unknown. His name comes from a Syrian passport found near a blast site, but authorities have not determined its authenticity.

Officials said the passport was processed on the Greek island of Leros, and the person carrying it arrived in Athens days later before apparently falling off the radar.